While I was in Florida last week, I thought the water was getting colder on Tuesday and Wednesday - it was great on Monday, and very cold by Wednesday - I was at Melbourne Beach (east coast), and the water there is normally in the 80's at this time of year. By Wednesday, it must have been in the 60's. That was weird. So I was interested by this article on cold water in the Atlantic:
Water temperatures at South Jersey beaches over the last two weeks have hovered in the high 50s and low 60s at a time of year when they are normally in the low 70s.
Some experts blame the chilly water on prevailing southwest winds. These can create currents that push the sun-warmed surface waters out to sea, said Charles Tilburg, a University of Delaware physical oceanographer. As the warm water heads out, frigid water comes up from the depths to replace it. That's "upwelling," a fairly common summer phenomenon along the coast.
If that article's right, it's going to play havoc with the tourist season on the east coast - water that cold is for surfers in body suits...